我有一个约会2014-11-02 16:57:29。我想把这个转换成长的我怎么能这样做？
我从链接上试过了https://pig.apache.org/docs/r0.14.0/api/org/apache/pig/piggybank/evaluation/datetime/convert/isotounix.html

DEFINE ISOToUnix org.apache.pig.piggybank.evaluation.datetime.convert.ISOToUnix();

DEFINE CustomFormatToISO org.apache.pig.piggybank.evaluation.datetime.convert.CustomFormatToISO();

ISOin = LOAD '/user/sample/test.csv' USING PigStorage() AS (dt:chararray, dt2:chararray);

toUnix = FOREACH ISOin GENERATE ISOToUnix(CustomFormatToISO(dt, 'YYYY-MM-DD HH:MM:SS')) AS event_time;

DUMP toUnix;

test.csv包含2014-11-02 16:57:29 2014-11-02 13:13:05
我要走了
[pouserfunc（名称：pouserfunc（org.apache.pig.piggybank.evaluation.datetime.convert.isotounix）[long]-scope-5运算符键：scope-5）子级：null at[]]：java.lang.nullpointerexception。
有人能帮帮我吗。谢谢